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Because natural disasters occur at rando...

Because natural disasters occur at random times, it is difficult to warn people _______.

A.at present         B.at last             C.on time           D.in advance

 

D 【解析】 试题分析:at present目前,现在;at last最后;on time准时;in advance事先,预先。句意是因为自然灾害是随时发生的,很难预先警告人们。故选D。 考点:短语辨析。
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